76121000821 has 4 divisors (see below), whose sum is σ = 76123166944. Its totient is φ = 76118834700.

The previous prime is 76121000777. The next prime is 76121000831. The reversal of 76121000821 is 12800012167.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 76121000821 - 2²¹ = 76118903669 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 76121000821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76121000831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1029465 + ... + 1100926.

It is an arithmetic number, because the mean of its divisors is an integer number (19030791736).

Almost surely, 2^76121000821 is an apocalyptic number.

It is an amenable number.

76121000821 is a deficient number, since it is larger than the sum of its proper divisors (2166123).

76121000821 is a wasteful number, since it uses less digits than its factorization.

76121000821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2166122.

The product of its (nonzero) digits is 1344, while the sum is 28.

Adding to 76121000821 its reverse (12800012167), we get a palindrome (88921012988).

The spelling of 76121000821 in words is "seventy-six billion, one hundred twenty-one million, eight hundred twenty-one", and thus it is an aban number.